Margit Schubert-While wrote:
b) Nowhere in /usr/src/linux/Documentation/* (specifically DocBook/writing_usb_driver.tmpl) is it documented that usb_bulk_msg requires DMA'able memory; although I agree that this is intuitive.
It's in Documentation/usb/dma.txt, and the kerneldoc for "struct urb" (referenced in DocBook/usb.tmpl) mentions the same requirement.
- Dave
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